thought I would share my results. I have a 07 3500 CC long box with a 5.9 these motors are junk and don't really have the longevity of the 1st and second gens. mine broke a ring in #1 cyl (190,000 miles.) so we pulled it for a rebuild including the head. stock other than a colt cam. (actually its my local cam guy borrowing their profile) centerline goes from 99 to 103*
got it all done last week and have just broke it. I am impressed with the power, colt says 2mpg and 4 psi more boost with the cam swap. engine sounds totally different, much less effort at cruising speed. more passing power. taking it in next week for a efi live tune and that's all I am going to do for now. in the spring I will do a Cold air and muffler change.

I was getting 19L/100km (12/US/mpg) after the rebuild, 11L/100k (22US/mpg) I figure ill be getting 24-6 US/mpg with the tune from the results I have seen with others.

so when (not if) your third gen melts #1 or #5-6 pistons or breaks rings look into a cam swap while your rebuilding, well worth the money.

Thanks for sharing. I have heard good things about changing cams. How is the smoke? My biggest complaint about my 05 is smoke. I go over a 7200' pass every day, and under the right conditions it smokes like a locomotive.

no smoke. never did smoke though. stock injectors. I would assume the extra boost helps with the smoke issue as well if there is one.

seems to work well. trying to get the tune on it this week and will see what happens then with smoke